DPS recommend apps (approved by Curriculum)
http://dpsrecommendedapps.wikispaces.dpsk12.org/
From Escondido school district, a sortable huge collection of educational apps
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https://spreadsheets.google.com/lv?key=tenru11ELMGfma9kDka2moQ&type=view&gid=0&f=true&sortcolid=0&sortasc=true&rowsperpage=250
TCEA recommended
http://www.tcea.org/ipad
Wiki offering multiple sites with recommended apps
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http://integrating-techoptions.wikispaces.com/Apps
Primary Apps - Apps for primary teachers, including 'pay-for' and free apps
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http://speirs.org/blog/2010/10/1/ipad-apps-for-primary.html
Top 10 list of apps for intermediate and secondary students
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http://www.speedofcreativity.org/2010/03/01/top-10-education-apps-for-ipod-touch-and-iphone/
Recommended and classroom tested apps sorted by subject area
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http://www.utechtips.com/2009/11/03/50-educational-apps-for-the-ipod-touch/
Literacy Apps for all reading levels
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http://www.ipadcurriculum.com/
Large collection of apps related to literacy and learning
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http://www.onlinecolleges.org/40-ipad-apps-that-librarians-love/
From basics on using iPads to grade level app recommendations
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http://teachwithyouripad.wikispaces.com/iPad+Apps
I Education Apps Review site features teacher vetted app reviews, with categories for age level and subject area
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http://www.iear.org/
EmergingEdTech list of the 10 best iPad apps for teachers
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http://www.emergingedtech.com/2011/03/10-excellent-ipad-applications-for-teachers/